Organic Mixed Valence Compounds Derived from Cyclic (Alkyl)(amino)carbenes

Readily
available room temperature stable organic mixed valence
compounds are prepared by one-electron reduction of cyclic bis­(iminium)
salts [derived from cyclic (alkyl)­(amino)­carbenes] bridged by various
spacers. These compounds show characteristic intervalence charge transfer
(IV-CT) bands in the near-infrared (NIR). Cyclic voltammetry, EPR,
IR, UV–vis, and X-ray studies, as well as DFT calculations,
show that, depending on the nature of the spacer, these mixed valence
compounds range from class III to class II.